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Section Information

Ionospheric Median Data Format

One median data file contains all available yearly data for the corresponding station and median
parameter. Downloaded median data files from SWS website have names of the form:

SSSS.PP

where:

SSSS - SWS Station Number, listed in following table/li>

PP - URSI parameter code, listed in following table

The format of each record in a data file is as follows.

Character position

Content

1-4

SWS Station Number

5-6

URSI parameter code

7-8

month

9-10

year

11-12

"40"

fields 13-168

24 space-separated hourly values and count (QVVVDCC)

where:

Q = qualifier

VVV = value

D = descriptor

CC = count (hourly values with counts less than 5 are not included)

Data is in universal time (UT). The first hour of each record is 0000 UT.

Note: Macquarie Island data from 1950 - 1958 is in local time (157.5 EMT, or 10.5
hours ahead of 00UT). The first hour of each record for this period is 0000 LT (midnight).

The URSI parameter codes are as follows.

Code

Parameter

Units

Ref. UAG23

Definition

00

foF2

0.1 MHz

1.11

Ordinary wave critical frequency of the highest stratification in the F region.

03

M(3000)F2

0.05

1.50

Maximum usable frequency at a defined distance divided by the critical frequency of that layer.

Below are two lists of the stations. In the first list, stations are sorted
by their SWS station numbers. In the second list, the stations are sorted
alphabetically. Geographic coordinates are given; southern latitudes are
negative.

Stations sorted by SWS station number:

SWS Station number

Station name

latitude

longitude

0019

GREAT BADDOW

51.43

0.29

0022

POITIERS

46.35

0.20

0025

TORTOSA

40.48

0.31

0040

DAPANGO

10.52

0.12

0090

POLE STATION

-89.99

346.68

0119

DE BILT

52.06

5.10

0120

DOURBES

50.24

3.47

0121

PARIS/BAGNEUX

48.48

5.88

0122

GARCHY

47.30

3.10

0134

TAMANRASSET

22.79

5.53

0141

IBADAN

7.43

3.90

0218

ST PETER-ORDING

54.18

8.37

0221

FREIBURG/KOCHEL

47.59

7.51

0222

SOTTENS/SCHWARZENBERG

46.49

7.21

0223

MONTE CAPELLINO

44.55

8.96

0315

KJELLER

60.00

11.10

0318

JULIUSRUH/RUGEN

54.60

13.40

0319

LINDAU/HARZ

52.58

11.10

0324

ROME

41.54

12.29

0326

GIBILMANNA

37.59

14.01

0406

LONGYEARBYEN

78.12

15.40

0415

UPPSALA

50.90

17.35

0420

PRUHONICE

49.99

14.55

0421

GRAZ

47.05

15.27

0447

KINSHASA-BINZA/LEOPOLDVILLE

-4.18

15.18

0455

TSUMEB

-19.13

17.42

0510

TROMSO

69.66

18.94

0511

KIRUNA

67.83

20.42

0513

LYCKSELE

64.36

18.40

0518

KALININGRAD

54.43

20.30

0519

MIEDZESZYN

52.15

20.40

0521

BUDAPEST

47.30

19.05

0523

BEOGRAD

44.50

20.30

0524

BEKESCSABA

46.41

21.06

0543

BANGUI

4.22

18.35

0562

CAPE TOWN/HERMANUS

-33.55

18.22

0612

LULEA

65.34

22.10

0615

NURMIJARVI

60.28

24.48

0624

SOFIA

42.41

23.19

0626

ATHENS

37.58

23.43

0662

GRAHAMSTOWN

-33.28

26.48

0711

SODANKYLA

67.29

26.32

0746

LWIRO

-2.30

28.80

0751

ELIZABETHVILLE

-11.40

27.28

0758

JOHANNESBURG

-26.15

28.10

0810

MURMANSK

68.63

33.25

0815

ST PETERSBURG/LENINGRAD

59.55

30.15

0820

KIEV

50.72

30.31

0844

BUNIA

1.34

30.15

0917

MOSCOW

55.47

37.31

0923

SIMFEROPOL

44.57

34.06

0946

NAIROBI

-1.17

36.49

1013

ARCHANGELSK

64.34

40.32

1021

ROSTOV-ON-DON

47.14

39.42

1080

SYOWA STATION

-69.00

39.35

1119

GORKY

56.20

44.00

1124

TBILISI

42.09

44.71

1139

DJIBOUTI

11.36

43.09

1254

TANANARIVE

-18.55

47.31

1305

TIKHAJA BAY

80.33

52.80

1327

TEHRAN

35.40

51.26

1405

KRENKEL POLAR STATION

80.50

58.00

1456

LA REUNION

-21.06

55.36

1510

AMDERMA

69.45

61.39

1517

SVERDLOVSK

56.51

61.07

1522

NOVO KAZAKINSK

45.50

62.10

1526

ASHKHABAD

37.95

58.12

1679

MAWSON

-67.36

62.52

1712

SALEKHARD

66.33

66.35

1724

TASHKENT

41.20

69.18

1820

KARAGANDA

49.50

73.10

1834

AHMEDABAD

23.02

72.35

1836

BOMBAY

19.11

72.50

1870

KERGUELEN ISLAND

-49.15

69.10

1923

ALMA ATA

43.15

76.57

1931

DELHI

28.37

77.12

1940

KODAIKANAL

10.23

77.46

1941

THUMBA/TRIVANDRUM

8.53

76.87

1979

DAVIS

-68.35

77.58

2008

DIKSON ISLAND/DIXON ISLAND

73.54

80.56

2036

HYDERABAD

17.41

78.56

2038

MADRAS

13.04

80.16

2040

TIRUCHIRAPELLI

10.48

78.41

2117

TOMSK

56.47

84.93

2118

NOVOSIBIRSK

55.02

82.55

2210

NORILSK

69.20

88.06

2214

PODKAMENNAYA TUNGUSKA

61.45

90.13

2378

MIRNEY

-66.33

93.00

2451

COCOS ISLANDS

-12.10

96.55

2538

BANGKOK

13.45

100.31

2619

IRKUTSK

52.17

104.45

2644

SINGAPORE

1.17

103.50

2730

CHUNGKING

29.39

106.34

2784

VOSTOK

-78.45

106.87

2807

PREOBRAZHENIYA

74.66

112.93

2819

CHITA

52.03

113.30

2832

CANTON

23.09

113.34

2834

MACAU

22.14

113.35

2835

HAIKOU

20.06

110.21

2856

LEARMONTH

-22.25

114.08

2878

CASEY/WILKES

-66.17

110.32

2920

MANCHOULI

49.35

117.22

2925

BEIJING

39.55

116.25

2960

WATHEROO

-30.32

115.88

2961

MUNDARING

-31.54

116.10

3032

TAIPEI/CHUNG-LI

24.95

121.22

3038

MANILA

14.35

120.59

3209

TIXIE BAY

71.58

128.48

3214

YAKUTSK

62.02

129.72

3226

SEOUL

37.33

126.58

3232

OKINAWA

26.31

127.59

3329

YAMAGAWA

31.12

130.39

3351

DARWIN

-12.28

130.50

3355

TENNANT CREEK

-19.40

134.10

3357

ALICE SPRINGS

-23.42

133.53

3421

KHABAROVSK

48.50

135.10

3446

BIAK

-1.18

136.12

3460

WOOMERA

-31.31

137.10

3522

WAKKANAI

45.25

141.40

3525

AKITA

39.43

140.07

3527

TOKYO

35.42

139.46

3546

VANIMO

-2.40

141.20

3562

SALISBURY

-34.46

138.38

3578

ADELIE LAND

-66.66

140.02

3622

YUZHNO-SAKHALINSK

46.95

142.72

3638

GUAM

13.58

144.87

3650

CAPE YORK

-14.00

142.30

3715

MAGADAN

59.34

150.48

3750

PORT MORESBY

-9.30

147.10

3755

TOWNSVILLE

-19.16

146.48

3763

CANBERRA

-35.17

149.08

3766

HOBART

-42.53

147.19

3859

BRISBANE

-27.28

153.02

3862

CAMDEN

-34.03

150.42

4018

PETROPAVLOVSK

52.90

158.64

4072

MACQUARIE ISLAND

-54.30

158.56

4182

TERRA NOVA BAY

-74.45

164.30

4260

NORFOLK ISLAND

-29.02

167.57

4271

CAMPBELL ISLAND

-52.30

169.00

4284

SCOTT BASE

-77.85

166.78

4367

CHRISTCHURCH

-43.42

172.38

4381

CAPE HALLETT

-72.19

170.18

4464

AUCKLAND

-36.53

174.45

4511

CAPE SCHMIDT

68.80

179.50

4619

ADAK

51.52

183.61

4660

RAOUL ISLAND/KERMADEC ISLANDS

-29.50

181.85

4712

WELLEN

66.13

190.17

4713

PROVIDENIE BAY

64.23

186.82

4755

NIUE

-19.03

190.08

4942

PALMYRA

5.52

197.94

5056

RAROTONGA

-21.14

200.54

5109

POINT BARROW

71.30

203.22

5135

KIHEI/MAUI

20.45

203.85

5144

CHRISTMAS ISLAND

1.52

202.80

5308

EIELSON AFB

64.50

213.00

5313

COLLEGE/FAIRBANKS

64.82

212.13

5314

ANCHORAGE

61.17

209.98

5354

TARAVAO/TAHITI

-17.56

210.39

5718

PRINCE RUPERT

54.18

229.83

5926

SAN FRANCISCO

37.77

237.57

6027

POINT ARGUELLO

34.35

239.62

6028

VANDENBURG AFB

34.43

239.67

6085

BYRD

-79.98

240.00

6329

WHITE SANDS

32.22

253.77

6425

BOULDER

40.13

254.77

6528

DYESS AFB

32.25

260.49

6535

MEXICO CITY/EL CERILLO

19.24

260.91

6608

RESOLUTE BAY

74.69

265.11

6613

BAKER LAKE

64.15

263.97

6616

CHURCHILL

58.47

265.88

6620

WINNIPEG/KENORA

49.47

265.71

6730

BATON ROUGE

30.53

268.85

6829

EGLIN AFB

30.29

273.70

7032

GRAND BAHAMA ISLAND

26.40

281.80

7040

PANAMA CANAL ZONE

9.20

280.70

7047

TALARA

-4.63

278.75

7122

OTTAWA

45.25

284.58

7125

FORT BELVOIR/WASHINGTON

38.85

282.97

7126

WALLOPS ISLAND

37.52

284.73

7143

BOGOTA

4.18

285.52

7151

HUANCAYO

-12.05

284.67

7223

MAYNARD

42.30

288.67

7224

BOSTON

42.37

288.97

7225

FORT MONMOUTH

40.19

285.98

7263

CONCEPCION

-36.50

286.97

7307

THULE

77.48

290.83

7310

CLYDE RIVER

70.25

291.70

7316

FORT CHIMO

58.10

291.70

7336

SAN JUAN/PUERTO RICO

18.12

293.85

7353

LA PAZ

-16.30

291.91

7372

USHUAIA

-54.47

291.80

7458

TUCUMAN

-26.49

294.87

7477

ARGENTINE ISLANDS/PORT LOCKROY

-65.25

295.73

7518

GOOSE BAY

53.19

299.76

7540

TRINIDAD

10.30

298.85

7562

BUENOS AIRES

-34.36

301.73

7576

DECEPCION

-62.57

299.62

7642

PARAMARIBO

5.81

304.78

7671

PORT STANLEY

-51.42

302.49

7710

GODHAVN

69.15

306.67

7721

ST JOHNS

47.60

307.32

7857

SAO PAULO

-23.32

313.63

7914

NARSSARSSUAQ

60.54

314.80

8084

ELLSWORTH

-77.40

318.90

8172

SOUTH GEORGIA

-54.15

323.55

8383

HALLEY BAY

-75.52

333.40

8513

REYKJAVIK

64.09

338.49

8638

DAKAR

14.40

342.74

8726

LISBON

38.43

350.92

8816

SOUTH UIST

57.15

352.76

8828

RABAT

34.02

353.49

8829

CASABLANCA

33.39

352.65

8916

INVERNESS/FRASERBURGH/BURGHEAD

57.27

356.51

8921

LANNION

48.44

356.72

8939

OUAGADOUGOU

12.22

358.69

8980

SANAE

-70.31

357.59

Stations sorted alphabetically:

SWS Station number

Station name

Latitude

Longitude

4619

ADAK

51.52

183.61

3578

ADELIE LAND

-66.66

140.02

1834

AHMEDABAD

23.02

72.35

3525

AKITA

39.43

140.07

3357

ALICE SPRINGS

-23.42

133.53

1923

ALMA ATA

43.15

76.57

1510

AMDERMA

69.45

61.39

5314

ANCHORAGE

61.17

209.98

1013

ARCHANGELSK

64.34

40.32

7477

ARGENTINE ISLAND

-65.25

295.73

1526

ASHKHABAD

37.95

58.12

0626

ATHENS

37.58

23.43

4464

AUCKLAND

-36.53

174.45

0121

BAGNEUX

48.48

5.88

6613

BAKER LAKE

64.15

263.97

2538

BANGKOK

13.45

100.31

0543

BANGUI

4.22

18.35

6730

BATON ROUGE

30.53

268.85

2925

BEIJING

39.55

116.25

0524

BEKESCSABA

46.41

21.06

0523

BEOGRAD

44.50

20.30

3446

BIAK

-1.18

136.12

7143

BOGOTA

4.18

285.52

1836

BOMBAY

19.11

72.50

7224

BOSTON

42.37

288.97

6425

BOULDER

40.13

254.77

3859

BRISBANE

-27.28

153.02

0521

BUDAPEST

47.30

19.05

7562

BUENOS AIRES

-34.36

301.73

0844

BUNIA

1.34

30.15

8916

BURGHEAD

57.27

356.51

6085

BYRD

-79.98

240.00

3862

CAMDEN

-34.03

150.42

4271

CAMPBELL ISLAND

-52.30

169.00

3763

CANBERRA

-35.17

149.08

2832

CANTON

23.09

113.34

4381

CAPE HALLETT

-72.19

170.18

4511

CAPE SCHMIDT

68.80

179.50

0562

CAPE TOWN

-33.55

18.22

3650

CAPE YORK

-14.00

142.30

8829

CASABLANCA

33.39

352.65

2878

CASEY

-66.17

110.32

2819

CHITA

52.03

113.30

4367

CHRISTCHURCH

-43.42

172.38

5144

CHRISTMAS ISLAND

1.52

202.80

2730

CHUNGKING

29.39

106.34

3032

CHUNG-LI

24.95

121.22

6616

CHURCHILL

58.47

265.88

7310

CLYDE RIVER

70.25

291.70

2451

COCOS ISLANDS

-12.10

96.55

5313

COLLEGE

64.82

212.13

7263

CONCEPCION

-36.50

286.97

8638

DAKAR

14.40

342.74

0040

DAPANGO

10.52

0.12

3351

DARWIN

-12.28

130.50

1979

DAVIS

-68.35

77.58

0119

DE BILT

52.06

5.10

7576

DECEPCION

-62.57

299.62

1931

DELHI

28.37

77.12

2008

DIKSON ISLAND

73.54

80.56

2008

DIXON ISLAND

73.54

80.56

1139

DJIBOUTI

11.36

43.09

0120

DOURBES

50.24

3.47

6528

DYESS AFB

32.25

260.49

6829

EGLIN AFB

30.29

273.70

5308

EIELSON AFB

64.50

213.00

6535

EL CERILLO

19.24

260.91

0751

ELIZABETHVILLE

-11.40

27.28

8084

ELLSWORTH

-77.40

318.90

5313

FAIRBANKS

64.82

212.13

7125

FORT BELVOIR

38.85

282.97

7316

FORT CHIMO

58.10

291.70

7225

FORT MONMOUTH

40.19

285.98

8916

FRASERBURGH

57.27

356.51

0221

FREIBURG

47.59

7.51

0122

GARCHY

47.30

3.10

0326

GIBILMANNA

37.59

14.01

7710

GODHAVN

69.15

306.67

7518

GOOSE BAY

53.19

299.76

1119

GORKY

56.20

44.00

0662

GRAHAMSTOWN

-33.28

26.48

7032

GRAND BAHAMA ISLAND

26.40

281.80

0421

GRAZ

47.05

15.27

0019

GREAT BADDOW

51.43

0.29

3638

GUAM

13.58

144.87

2835

HAIKOU

20.06

110.21

8383

HALLEY BAY

-75.52

333.40

0319

HARZ

52.58

11.10

0562

HERMANUS

-33.55

18.22

3766

HOBART

-42.53

147.19

7151

HUANCAYO

-12.05

284.67

2036

HYDERABAD

17.41

78.56

0141

IBADAN

7.43

3.90

8916

INVERNESS

57.27

356.51

2619

IRKUTSK

52.17

104.45

0758

JOHANNESBURG

-26.15

28.10

0318

JULIUSRUH

54.60

13.40

0518

KALININGRAD

54.43

20.30

1820

KARAGANDA

49.50

73.10

6620

KENORA

49.47

265.71

1870

KERGUELEN ISLAND

-49.15

69.10

4660

KERMADEC ISLANDS

-29.50

181.85

3421

KHABAROVSK

48.50

135.10

0820

KIEV

50.72

30.31

5135

KIHEI

20.45

203.85

0447

KINSHASA-BINZA

-4.18

15.18

0511

KIRUNA

67.83

20.42

0315

KJELLER

60.00

11.10

0221

KOCHEL

47.59

7.51

1940

KODAIKANAL

10.23

77.46

1405

KRENKEL POLAR STATION

80.50

58.00

8921

LANNION

48.44

356.72

7353

LA PAZ

-16.30

291.91

1456

LA REUNION

-21.06

55.36

2856

LEARMONTH

-22.25

114.08

0815

LENINGRAD

59.55

30.15

0447

LEOPOLDVILLE

-4.18

15.18

0319

LINDAU

52.58

11.10

8726

LISBON

38.43

350.92

0406

LONGYEARBYEN

78.12

15.40

0612

LULEA

65.34

22.10

0746

LWIRO

-2.30

28.80

0513

LYCKSELE

64.36

18.40

2834

MACAU

22.14

113.35

4072

MACQUARIE ISLAND

-54.30

158.56

2038

MADRAS

13.04

80.16

3715

MAGADAN

59.34

150.48

2920

MANCHOULI

49.35

117.22

3038

MANILA

14.35

120.59

5135

MAUI

20.45

203.85

1679

MAWSON

-67.36

62.52

7223

MAYNARD

42.30

288.67

6535

MEXICO CITY

19.24

260.91

0519

MIEDZESZYN

52.15

20.40

2378

MIRNEY

-66.33

93.00

0223

MONTE CAPELLINO

44.55

8.96

0917

MOSCOW

55.47

37.31

2961

MUNDARING

-31.54

116.10

0810

MURMANSK

68.63

33.25

0946

NAIROBI

-1.17

36.49

7914

NARSSARSSUAQ

60.54

314.80

4755

NIUE

-19.03

190.08

4260

NORFOLK ISLAND

-29.02

167.57

2210

NORILSK

69.20

88.06

1522

NOVO KAZAKINSK

45.50

62.10

2118

NOVOSIBIRSK

55.02

82.55

0615

NURMIJARVI

60.28

24.48

3232

OKINAWA

26.31

127.59

7122

OTTAWA

45.25

284.58

8939

OUAGADOUGOU

12.22

358.69

4942

PALMYRA

5.52

197.94

7040

PANAMA CANAL ZONE

9.20

280.70

7642

PARAMARIBO

5.81

304.78

0121

PARIS

48.48

5.88

4018

PETROPAVLOVSK

52.90

158.64

2214

PODKAMENNAYA TUNGUSKA

61.45

90.13

6027

POINT ARGUELLO

34.35

239.62

5109

POINT BARROW

71.30

203.22

0022

POITIERS

46.35

0.20

0090

POLE STATION

-89.99

346.68

7477

PORT LOCKROY

-65.25

295.73

3750

PORT MORESBY

-9.30

147.10

7671

PORT STANLEY

-51.42

302.49

2807

PREOBRAZHENIYA

74.66

112.93

5718

PRINCE RUPERT

54.18

229.83

4713

PROVIDENIE BAY

64.23

186.82

0420

PRUHONICE

49.99

14.55

7336

PUERTO RICO

18.12

293.85

8828

RABAT

34.02

353.49

4660

RAOUL ISLAND

-29.50

181.85

5056

RAROTONGA

-21.14

200.54

6608

RESOLUTE BAY

74.69

265.11

8513

REYKJAVIK

64.09

338.49

0324

ROME

41.54

12.29

1021

ROSTOV-ON-DON

47.14

39.42

0318

RUGEN

54.60

13.40

7721

ST JOHNS

47.60

307.32

0218

ST PETER-ORDING

54.18

8.37

0815

ST PETERSBURG

59.55

30.15

1712

SALEKHARD

66.33

66.35

3562

SALISBURY

-34.46

138.38

8980

SANAE

-70.31

357.59

5926

SAN FRANCISCO

37.77

237.57

7336

SAN JUAN

18.12

293.85

7857

SAO PAULO

-23.32

313.63

0222

SCHWARZENBERG

46.49

7.21

4284

SCOTT BASE

-77.85

166.78

3226

SEOUL

37.33

126.58

0923

SIMFEROPOL

44.57

34.06

2644

SINGAPORE

1.17

103.50

0711

SODANKYLA

67.29

26.32

0624

SOFIA

42.41

23.19

0222

SOTTENS

46.49

7.21

8172

SOUTH GEORGIA

-54.15

323.55

8816

SOUTH UIST

57.15

352.76

1517

SVERDLOVSK

56.51

61.07

1080

SYOWA STATION

-69.00

39.35

5354

TAHITI

-17.56

210.39

3032

TAIPEI

24.95

121.22

7047

TALARA

-4.63

278.75

0134

TAMANRASSET

22.79

5.53

1254

TANANARIVE

-18.55

47.31

5354

TARAVAO

-17.56

210.39

1724

TASHKENT

41.20

69.18

1124

TBILISI

42.09

44.71

1327

TEHRAN

35.40

51.26

3355

TENNANT CREEK

-19.40

134.10

4182

TERRA NOVA BAY

-74.45

164.30

7307

THULE

77.48

290.83

1941

THUMBA

8.53

76.87

1305

TIKHAJA BAY

80.33

52.80

2040

TIRUCHIRAPELLI

10.48

78.41

3209

TIXIE BAY

71.58

128.48

3527

TOKYO

35.42

139.46

2117

TOMSK

56.47

84.93

0025

TORTOSA

40.48

0.31

3755

TOWNSVILLE

-19.16

146.48

7540

TRINIDAD

10.30

298.85

1941

TRIVANDRUM

8.53

76.87

0510

TROMSO

69.66

18.94

0455

TSUMEB

-19.13

17.42

7458

TUCUMAN

-26.49

294.87

0415

UPPSALA

50.90

17.35

7372

USHUAIA

-54.47

291.80

6028

VANDENBURG AFB

34.43

239.67

3546

VANIMO

-2.40

141.20

2784

VOSTOK

-78.45

106.87

3522

WAKKANAI

45.25

141.40

7126

WALLOPS ISLAND

37.52

284.73

7125

WASHINGTON

38.85

282.97

2960

WATHEROO

-30.32

115.88

4712

WELLEN

66.13

190.17

6329

WHITE SANDS

32.22

253.77

2878

WILKES

-66.17

110.32

6620

WINNIPEG

49.47

265.71

3460

WOOMERA

-31.31

137.10

3214

YAKUTSK

62.02

129.72

3329

YAMAGAWA

31.12

130.39

3622

YUZHNO-SAKHALINSK

46.95

142.72

Qualifying Letters:

A - Less than. Used only when fbEs is deduced from foEs because total blanketing of higher layers is present.

G - Measurement influenced by, or impossible because the ionisation density of the reflecting layer is too small to enable it to be made accurately.

H - Measurement influenced by, or impossible because of, the presence of stratification.

K - Presence of a particle E layer.

L - Measurement influenced by, or impossible because the trace has no sufficiently definite cusp between the layers.

M - Interpretation of measurement questionable because ordinary and extraordinary components are not distinguishable. Used when interpretation is doubtful and a qualifying letter needed for other reasons (e.g., U, D, E).